Aviation safety investigations & reports

Hiller UH 12-E, VH-FFX, 14 km SE Gympie QLD, 23 May 1987

Investigation number:
Status: Completed
Investigation completed


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The pilot reported that the helicopter was cruising at 2000 feet when, without warning, there was a complete loss of engine power. During the subsequent forced landing, the tail boom struck the ground, causing the tail rotor gear box to separate from the aircraft. Investigation revealed that the engine accessory gear train had failed, causing both magnetos to cease operation. The gear train failed due to lack of torque followed by the fatigue failure of six screws that attach the accessory drive gear to the starter gear. The cause of the loss of torque was not established.

Download Final Report
[Download  PDF: 22KB]
General details
Date: 23 May 1987   Investigation status: Completed  
Time: 1440    
Location: 14 km SE Gympie    
State: Queensland    
Release date: 08 November 1988   Occurrence category: Accident  
Report status: Final   Highest injury level: None  

Aircraft details

Aircraft details
Aircraft manufacturer Hiller Aviation  
Aircraft model UH-12  
Aircraft registration VH-FFX  
Serial number 5066  
Type of operation Business  
Damage to aircraft Substantial  
Departure point Caloundra QLD  
Departure time 1420  
Destination Rockhampton QLD